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Solution


Q.

In the following groups of materials, which groups contain only non-biodegradable items

(i) Wood, paper, leather
(ii) Polythene, detergent, PVC
(iii) Plastic, detergent, grass
(iv) Plastic, bakelite, DDT
1 (iii)  
2 (iv)  
3 (i), (iii)  
4 (ii), (iv)  

Ans.

(4)

Those items which cannot be acted upon by detritivores or decomposers are called as non-biodegradable. As a result, such materials are unable to degrade or decompose. They are, in some ways, an inextricable part of the environment that cannot be removed. Polythene, thermosetting plastics such as Bakelite, insecticides such as DDT, detergent, and PVC are few examples of non-biodegradable items.